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Flood hazard assessment via threshold binary classifiers: case study of the Tanaro River basin

Degiorgis, Massimiliano and Gnecco, Giorgio and Gorni, Silvia and Roth, Giorgio and Sanguineti, Marcello and Taramasso, Angela Celeste Flood hazard assessment via threshold binary classifiers: case study of the Tanaro River basin. Irrigation and Drainage, 62 (S2). pp. 1-10. ISSN 1531-0353 (2013)

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Abstract

This contribution deals with the identification of flood hazards at the catchment scale. The aim is to distinguish flood-exposed areas from marginal risk ones, and to extend available information on flood hazards to cover the whole catchment. Threshold binary classifiers based on six selected quantitative morphological features, derived from data stored in digital elevation models (DEMs), are used to investigate the relationships between morphology and the flooding hazard, as described in flood hazard maps. Results show that threshold binary classifier techniques should be taken into account when one is interested in an initial low-cost detection of flood-exposed areas. This may be needed, for example, in applications related to the insurance market, in which one is interested in estimating the flood hazard of specific areas for which limited information is available, or whenever a first flood hazard delineation is required to further address detailed investigations for flood mapping purposes. The method described in the paper has been tested on the basin of the Tanaro River. Results present a high degree of accuracy: indeed, the best classifier correctly identifies about 91% of flood-exposed areas, whereas the percentage of the areas exposed to marginal risk that are incorrectly classified as flood-exposed areas is about 16%

Item Type: Article
Identification Number: 10.1002/ird.1806
Additional Information: Article first published online: 3 DEC 2013
Uncontrolled Keywords: flood risk detection; flood hazard management; area under the ROC curve; threshold binary classification; Shuttle radar topography mission
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Research Area: Computer Science and Applications
Depositing User: Giorgio Gnecco
Date Deposited: 17 Sep 2013 12:59
Last Modified: 29 Jan 2014 10:28
URI: http://eprints.imtlucca.it/id/eprint/1765

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